Means for driving spindles



Sept. 20, 1927.

J. KIRNER IEANS- FOR DRIVING SPINDLES Filed May 10. 1924 .b E/ V/l/Ea 9w. t H

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JQSEF KIRNER, OF STUTTGART, GERM.

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Application filed May 10, 1924, Serial No.

-My invention refers to means for driving- Amongst the different means for driving spindles, the friction gear drive is distinuished as being easily thrown in and out by it: merely liftin and lowering the spindle respectively. n the other hand, a spindle driven by means of friction wheels is likely to execute undesirable vertical movements, usually called hopping movements. it is of w coursepossible to prevent such movements from arising by reventing the spindle from movin axially, ut in that case the possibility is lost of easily throwing the friction drive in and out. I

According to the present invention now, the spindle is efiectually'prevented from hopping, while being still enabled to move in vertical direction, so that it can easily be thrown in and out.

In order to fully explain my invention and how the same is to be periormed, I have illustrated in the drawings annexed to this specification by way of example the new spindle arrangement according to the pres- I cut invention.

In the drawings Figs. 1 .and2 are axial sections of two forms of friction drives embodying my 111- vention by way of example.

Referring first to Fig. l, the shaft a of the indle is entirel smooth and hasthe friction disc-b rigi yconnected with it, r isa.

roller bearin surrounding shaft a. Experiments have s own that a'spindle surrounded 40 by a roller bearing cannot ,be displaced in axial direction as easily as in the case of a simple journal bearing. For, while in the circumferential movement of the spindle only the very1 low roller friction must be overcome every attemptto quickly displace the spindle in axial direction will firstcause the rollers to tilt somewhat, and this tilting of the rollers renders a quick displacing of the spindle in axial directiondiflicult and acts towards damping any attempts of the spindle to hop in axial direction. Therefore axial shocks of short duration, such aswill be caused by lateral oscillation or wearing down of the driving wheel, will merely 712,404, and in Germany August 20, 19523.

cause an elastic change of forni of the soft material covering the friction disc. On the other hand, the spindle can still be thrown out orstopped by lifting disc 6 off the wheel a driving it, because this stopping movement is carried. out comparatively slowly.

Instead of providing the fri tion disc with an elastic covering, it may also lieacted u on by a spring (as shown for instance/in lg. 52), this being particularlfrecolnmendahle in cases where the wheels are likely to oscillate M or to wear down so as to get oval. In this case the expansion of the spring is limited in such manner that the spindle "can still be thrown out by lifting it. i

I wish it to be understood that I do not desire to be limited to the exactdetails of construction shown and described, for 'ob vious modifications will occur to'a person. skilled in the art. V

I claim 1. Means for driving spindles, comprising a substantially vertical spindle arranged for free axial displacement, a driving wheel near said spindle, a friction wheel on said spindle and resting on said drivin support the spindle, a rol er bearing sur rounding and in contact with said spindle, and means'for preventin lon 'tudinal displacement of the rollers t ereo 2. Means for drivin spindles, comprising 8! I a substantially vertica spindle arranged for free axial displacement, a driving wheel near said'spindle, a friction wheel on said spindle and resting on said driving wheel soas to support'the spindle, aspring adapted to act 99 on said friction wheel so as to ress it against said driving wheel and a rol er bearing-including' means' for restraining the rollers against longitudinal movement surrounding I and in contact with said spindle. 96

3. Means for drivi'ngspindles comprising a substantially verticalv spindle arranged for .free axial displacement, a driving wheel near said spindle, a friction wheel on said spindle and resting-0n said driving wheel so as to 100s support the spindle, a spring adapted to act on said fi'iction wheel so as to press it against said driving wheel, a roller hearing surrounding and in contact with'said spindle and an abutment for the upper end of said spring on said spindle.

In testimony whereof I in Si w re.

. J'OSEF t! R R.

wheel so as to 

